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AC Conductivity of carbon fiber-polymer matrix composites at thepercolation threshold

机译：渗流阈值下碳纤维-聚合物基复合材料的交流电导率

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This paper reports results on rexperimental investigation of the conductivity behavior of carbon fiber filled polymer composites at the percolation threshold.Two types of carbon fiber-epoxy matrix composites have been studied and comparison of the measured data has been made.These two types of composites differ inthe surface modification of carbon fibers (in one case the surface of carbon fibers is covered withpolymer beads using the microencapsulation technology,in theother their surface stayed unmodified).Experimental data reveal that surface modificationofcarbon fibers in fluences greatly the DC conductivity (percolation threshold moves to higher concentrations) but does notinfluence the AC electrical properties.From the frequency dependence of conductivity upon fiber concentration it becomes clear that it is not possible to predict the hiigh frequency conductivity (electromagnetic intererence shielding properties) based on the DC conductivity.Percolation behavior of conductivity as a functionof conductive filler concentration is typical only for DC or low frequency AC conductivity.The percolation threshold gradually vanishes for high frequencies of electromagnetic field.Thetemperature dependence of electricalproperties has also been studied.Composites with concentrationnear the percolation threshold show the switch-off effect (at thespecific temperature the DC conductivity dorps by severalorders of magnitude).This switch-off effect does not occur for high frequency AC conductivity.
机译：本文报道了碳纤维填充聚合物复合材料在渗流阈值下的导电性能的实验研究结果。研究了两种类型的碳纤维-环氧树脂基复合材料，并比较了测量数据。这两种类型的复合材料不同实验数据表明，碳纤维的表面改性对直流电导率有很大影响（渗滤阈值移动到5％），在一种情况下碳纤维的表面改性（一种情况是碳纤维的表面使用微囊技术覆盖了聚合物珠，而另一种表面则保持不变）。从较高的浓度），但不影响交流电性能。从电导率对纤维浓度的频率依赖性可以明显看出，不可能根据直流电导率来预测高频率电导率（电磁干扰屏蔽特性）。如导电填料浓度的函数仅对于DC或低频AC导电性而言是典型的。渗漏阈值对于高频电磁场逐渐消失。还研究了电性能的温度依赖性。在渗漏阈值附近具有浓度的复合物表现出关断效应（在特定温度下，直流电导率会降低几个数量级。对于高频交流电，这种关断效应不会发生。

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